Victaulic 769N FireLock NXT Series - External Inspection Procedures

I-769N.Preaction/AC-ELEC / Victaulic
®
Series 769N FireLock NXT
™
/ Installation, Maintenance, and Testing Manual
WEEKLY EXTERNAL INSPECTION
CAUTION
• Perform a visual inspection of the valve and trim on a weekly
basis.
• If the preaction system is equipped with a low-pressure alarm,
monthly inspections may be sufficient. Contact the local
authority having jurisdiction for specific requirements.
Failure to perform weekly inspections may result in damage to the
valve and trim.
On a weekly basis, when the valve is reset after an operational test
(or after any system operation): The water supply main drain valve and
any low-point drains should be partially opened and then closed to drain
water that might be present in the riser. Continue this procedure until all
water is released. NOTE: The optional Series 75D Water Column Kit can
be installed to automate this step.
MONTHLY EXTERNAL INSPECTION
1. Record the system air pressure and water supply pressure.
Confirm that the water supply pressure is within the range of
normal pressures observed in the area. Significant loss of water
supply pressure could indicate an adverse condition in the water
supply. Confirm the proper water-to-air ratio is being maintained.
2. Confirm that there is no leakage from the intermediate valve
chamber. The ball drip on the alarm manifold assembly should not
be leaking water or air.
3. Inspect the valve and trim for mechanical damage and corrosion.
Replace any damaged or corroded parts.
4. Confirm that the actuated valve and trim are located in an area
that is not subject to freezing temperatures.
5. Confirm that all valves are in their normal operating positions (refer
to the table below).
Valve Normal Operating Position
Water Supply Main Control Valve Open
Water Supply Main Drain Valve Closed
System Main Drain Valve Closed
Charge Line Ball Valve of the Priming Manifold Assembly Open
Alarm Test Ball Valve of the Priming Manifold Assembly Closed
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable) Open
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable) Closed
Isolation Ball Valve for Series 746-LPA Dry Accelerator
(if applicable)
Open
¼-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator
(if applicable)
Closed
Ball Drip
(Step 2)
I-769N.Preaction/AC-ELEC_19REV_A